added Klaas Jan's stress spec to spec suite
added Klaas Jan's stress spec to spec suite

moritoru81/rufus-scheduler,kssminus/rufus-scheduler,moss-zc/rufus-scheduler,jmettraux/rufus-scheduler,urubatan/rufus-scheduler,railsfactory-kumaresan/rufus-scheduler,AndBicScadMedia/rufus-scheduler,shutl/rufus-scheduler,0612800232/rufus-scheduler,safesoftware/rufus-scheduler